## Quick Reference

Cognitive processing directed at finding solutions to well-defined problems, such as the Tower of Hanoi, Wason selection task, or a water-jar problem, by performing a sequence of operations. Problem solving by means of logic or logical analysis is usually called reasoning. See also 2-4-6 problem, algorithm, brute force algorithm, convergence-divergence, functional fixedness, General Problem Solver, ill-defined problem, insight (2), intelligence, lateral thinking, Monty Hall problem, muddy children problem, Newcomb's problem, nine-dot problem, oddity problem, problem-solving stages, taxicab problem, travelling salesman problem, well-defined problem. [From Latin *problema*, something put forward, from Greek *pro* before or forward + *ballein* to throw]

*Subjects:*
Psychology.

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